1. Ventricular asystole due to atrial oversensing by a VVI pacemaker: VVT mode as a simple solution 
Kazushi Tanaka, Osamu Fujimura 
Journal of Arrhythmia 
Volume 28, Issue 5, Pages (October 2012)
DOI: /j.joa
Copyright © 2012 Japanese Heart Rhythm Society Terms and Conditions

2. Fig. 1
Ventricular asystole due to oversensing of atrial electrogram in a VVI pacemaker. Arrowheads represent P waves. Note that there were no pacemaker spikes. The paper speed was 25mm/sec.
Journal of Arrhythmia  , DOI: ( /j.joa )
Copyright © 2012 Japanese Heart Rhythm Society Terms and Conditions

3. Fig. 2
Inverted chest X-ray image showing the tip of the pacemaker lead placed in the right ventricular inflow close to the tricuspid annulus (1). A temporary pacemaker lead (2) was placed in the right ventricular apex.
Journal of Arrhythmia  , DOI: ( /j.joa )
Copyright © 2012 Japanese Heart Rhythm Society Terms and Conditions

4. Fig. 3
Far-field sensing of atrial electrogram by VVT pacing. Note that the atrioventricular interval was constant at approximately 100ms, leading to an increase in ventricular rate from 75 to 100 beats per minute (panels A and B). Panel C shows the development of an intermittent atrial sensing failure (first, second, fifth, and sixth beats); however, ventricular sensing was maintained, thereby eliciting a pacemaker spike within each QRS complex. The third and fourth beats show “appropriate” atrial sensing. V1, V2, V3, and II represent the surface electrocardiographic leads. The paper speed was 25mm/s.
Journal of Arrhythmia  , DOI: ( /j.joa )
Copyright © 2012 Japanese Heart Rhythm Society Terms and Conditions